Software Developer

We are seeking an experienced Software Developer (.NET) to join an agile cross-functional product team responsible for the design development and continuous evolution of a Gas Flow Management (GFM) digital platform.

The solutions developed by the team support end-to-end commercial and operational processes in large-scale energy infrastructure environments. These systems span the full gas flow lifecycle including customer onboarding contracting demand handling flow planning network balancing billing and invoicing data publication reporting and business-to-business messaging.

This role offers the opportunity to work on a long-lived mission-critical product where software quality architectural integrity and business alignment are essential. You will actively contribute to feature design system evolution and technical decision-making in a context of high reliability and regulatory complexity.

Key Responsibilities

• Design develop and maintain high-quality scalable and -based software components

• Translate complex business and operational requirements into robust technical solutions in close collaboration with product owners and analysts

• Contribute to architectural discussions proposing improvements that enhance performance reliability and long-term maintainability

• Implement automated tests and actively participate in functional and technical testing activities

• Perform code reviews share knowledge and uphold agreed development standards

• Support release preparation including technical documentation and deployment activities

• Participate in user acceptance testing (UAT) and product demonstrations ensuring solutions are understandable and usable for business stakeholders

• Handle functional and technical service requests providing timely and effective support

• Investigate and resolve incidents collaboratively minimising operational impact

• Monitor and troubleshoot issues across development testing and production environments

• Actively participate in Agile ceremonies including backlog refinement sprint planning reviews retrospectives and daily stand-ups

• Contribute to the product backlog by creating technical items expressed in business-oriented language supporting value-based prioritisation
  

Technical Skills

Core Technologies

• Backend: .NET 8 / .NET Framework Web API WCF

• Data & Messaging: SQL Server Oracle RabbitMQ NHibernate Entity Framework

• Architecture: Domain-Driven Design (DDD) Clean Architecture design patterns

• Testing & CI/CD: xUnit / NUnit Azure DevOps Pipelines

• Frontend: Blazor (nice to have)

• DevOps & Tooling: Git Azure DevOps automated deployment and monitoring tools
  

Professional Competencies

• Strong foundation in software design principles and clean coding practices

• Experience working with complex enterprise-grade systems and long-term codebases

• Solid understanding of testing strategies and CI/CD pipelines

• Ability to communicate effectively with both technical and non-technical stakeholders

• Fluency in Portuguese and English (C1 level); knowledge of French or Dutch is an advantage
  

Mindset & Ways of Working

• Product-oriented: You focus on delivering tangible value not just completing tasks

• Collaborative: You work effectively within multidisciplinary teams and value shared ownership

• Analytical and Curious: You challenge assumptions and seek continuous improvement

• Adaptable: You remain effective in changing environments and evolving priorities

• Quality-driven: You prioritise sustainable reliable solutions over short-term fixes

• Accountable and Transparent: You take ownership of outcomes and communicate openly

• Committed to Learning: You stay engaged with evolving technologies domains and practices
  

Practical Information

• Location: Lisbon

• Working Model: Hybrid on-site presence required two days per week